The main source of income, tourism, is expected to dry up completely this summer.

作为主要收入来源的旅游业预计将在今年夏天彻底枯竭。

《柯林斯英汉双解大词典》

The part of the hotel room is the main source of income.

客房部分是酒店收益的主要来源。

youdao

In India, sales tax is the main source of income for the states.

在印度，营业税是主要的收入来源。

youdao

As idyllic as this area looked, water shortages had become a huge problem, particularly affecting the main source of income here, agriculture.

BBC: Part II: The road to Bethlehem

The village, which is on the edge of the West Bank, contains a market of 170 shops and is the main source of income for Nazlat Issa's residents.

BBC: Israelis flatten West Bank shops

Agriculture remains the main source of income for many.

BBC: Imani Green: Jamaican town hit hard by murder